Process of manufacturing metal goods



Sept. 29, 1925.

F. KIRSCHNER PROCESS DEMANUFAGTURING METAL GOODS Filed Oct. 12. was

which it is possible,

I6 baths of so a fine wire sieve, for

to form 4 actingeasi solder metal.

l at ented Sept. 29, .1925.

UNITED STATES PATENT OFFICE.

FELIX KIRSUHNER, OI VIENNA, AUSTRIA.

success or mauuracrunme METAL GOODS.

Application filed October 12, 1928. Serial No. 668,181.

To all whom it may concern:

Be it known that I, FELIX KIRSCHNER, subject of the Republic of Switzerland, residing at Vienna, XVII, Dornbacherstrasse 5 72, Austria, have invented certain new and useful Improvements in Processes of Manufacturing Metal Goods, of which the following is a specification.

This invention relates to a process by by simple means capable of being carried out on a very large scale, to make the very finest woven, plalted or the like articles of metal strong and resisting, so that the goods cannot easily be 15 torn or damaged and any extension of damage already done is prevented, whilst at the same time their quality inpermeabihty is improved. These results are. of very great importance in the use for technical I0 purposes of all woven, plaited and the like goods that are made out of fine wire, metal strips and the like, and in particular for metal sieves and metal cloths of the finer grades. The dipping of the goods into fused metal as is often done in a case of coarser woven and plaited goods made of thick wire or thick strips of metal is quite out of the question in the case of.

the finer goods under consideration, as if example, is dipped in a bath of fused metal, the fine meshes are entirely closed up and the=sieve is in this way converted into an impermeable sheet.

The process forming the subject of the as present invention can be carried out in avariety of ways. A woven or plaited article of bright wire or metal strip can, for

example, first be galvanically provided with a coating of a metal or metal alloy adapted a solder and thereafter the wire or metal strip elements of the goods, atthe points where they cross or come into contact with or closely adjoin one another, are soldered by means of the galvaniccoating The invention can also carried out or plaited or the like goods out of wire or metal strips the surface of which has alreadybeen coated with a metal capable of acting as a solder and thereafter the points of contact or points where the wire or strip elements cross are soldered by means of the solder metal on their surface.

Below is described one application of the by making the wovenplaces in areas in the continuous process to the manufacture of metal fabrics such as metal sieves or the like of fine grade, where tin for example galvanically applied is used as the soldering metal.

In the accompanying drawing, Fig. 1 is a cross section. and Fig. 2 a plan, both on a greatly enlarged scale of a sieve-with strands of hair of like fineness, constituting the clean starting product of the process Fig. 3 is a cross section; and Fig. 4 a plan of the intermediate product which results from galvanizing the starting product of F gs. 1 and 2 Fig. 5 is across section; and F g. 6 a plan of the final product, cons sting of a sieve with strands of hair of like fineness secured together by the process of the presentinvention.

The metallic fabric is freed from grease and oxides and put into a galvanic tin bath, preferably one which allows theuse of high course, be provided with a heavier tin coat-,

ng than 1s necessary for the strong soldering of the points of contact and crossing polnts oi the metal goods. This heavier coating can, for example, be applied with great advantage in many cases in order to effect a further and finely 'regulable reduction in size of the, meshes of the metal article, while at the same time effecting the soldering of the crossing and'contactin metal elements. The wire fabric is pre erably fed in continuous operation from a coil or roll, through the galvanic bath, and then, after the application of a solder fluid or paste is led through a solder furnace of any known or suitable kind with or without water cooling, and since the finished roduct possesses good flexibility, the finishe article can be rolled up. In this process the crossing and contacting points of the wire or metal strip elements are soldered in their piogress of the goods through the soldering rnace.

Instead of with the solder fluxes common- 1y employed, the fusing of the galvamc coating can with great a vantage be eflectpared flux, consisting ed with the assistance of a specially prefor example of ammonium chloride, hydrochloric acid and such metal salt solutions as are capable of precipitating upon the galvanic coating the metal of the metal salt solution. A suitable composition for the flux is the following: 10 to parts by weight of concentrated hydrochloric acid, 10 to 40 parts by weight of ferric chloride solution (30 to 70%), 20 to 40 parts by weight of concentrated ammonium chloride solution, and 20 to 40. parts by weight of a 5 to 20% copper sulphate solution. i

When this flux is used the process can also be carried on continuously. llhe wire fabric is in this case first of all led through the galvanic bath and after leaving the bath is sprayed with water. the flux is then applied in a finely divided state to the metal fabric and the goods thus treated are exexample given above,

posed to a temperature at which the tin coating with the assistance of the flux fuses on to the wire fabric.

- Another application of the process. according to the present invention is the following. Wire or metal strip elements are first of all provided by means of any metallizing process with a surface adapted to .act as asolder and these elements are then manufactured into the desired product by weaving, plaiting or the like and afterwards the crossing or contacting wires or strips are of the metal in their solder forming surfaces. This process can with advantage be employed particularly for such articles as in their finished form are difficult to galvanize, as for example articles which in consequenceof their shape or stru-c-- ture have surfaces running one other, which would not be satisfactorily coated in the galyanizing process in consequence of the unfavourable distribution of current lines.

The process according to the present invention. particularly as embodied in the first produces quite new industrial productions for the fine metal fabric industry. for hitherto woven fabrics formed of fine wire with quite small meshes beneath ancould not be made in a form that was not easily torn or damaged. In addition to this, however, the new process brings about a surprising improvement in the permeability of such goods, even those of the finest fabric, such as sieves and the like, whether solid or liquid material is to be sieved or filtered. Figs. 1 and 2 of the drawing show clearly that the warp strands 1 and weft strands 2 of the mesh heretofore commonly employed have no connection with each other at the places of intersection, and are therefore relatively movable. Fi that at the intersectlons of the strands. 1

.that shown in Figs.

the intersections o galvanic coating is less than elsewhere, because during the galvanic action 1 also shows clearly and 2 certain spaces or interstices 3 are resent. u, In sievlng dry materials or strainmg materials containing liquids, a dc osit is formed in these interstices and this eposit, Ifind, is the cause of stoppage of the mesh.

-When the article shown in Figs. 1 and 2 is galvanized an intermediate product, like 3 and 4, results. At the strands 1 and 2, the

the current is deflected at the and conseintersections,

'quently a coating of less thickness than elsewhere is deposited in the interstices 3. As shown in Fig. 4:, the space defined by the crossed strands is angular. treatingthis intermediate product, in the manner above described, the interstices 3 are filled and rounded out by the molten material and at the same time the strands 1 and 2 Upon further are firmly connected together at the intersections.

It developed in practice that the molten coating metal fills out the interstices 3end the parts adjacent thereto-so that a rounded mesh contour (Fig. 6) results, which materially reduces the danger of stoppage of the sieve. I have also found that when galvanically applied metals are used and are fused onto the strands with the aid of suitable fluxes, the filling out or rounding oft of the inner walls of the 'mesh is greatly facilitated. soldered together. by means What is claimed is:

1. The herein described method of securing and stiffening metallic wares composed of adjacently lying or inter-secured metal elements, which consists in galvanically providing the bare elements with an easily fusible metallic coating, and thereupon fusing the coating to the elements to unite the latter rigidly at their intersections, the metal of said coating being of sufficient strength to produce an undistortable final product.

2. The herein described method of securing and stiffening metallic wares composed of adjacently lying or inter-secured metal elements, which consists in weaving metal strands to form the article, said strands being of material having an easily fusible surface, and thereupon fusing the material of said surface to unite the strands rigidly v ing and stiffening metallic wares composed of adjacently lying or inter-secured metal elements, which consists in inter-weaving metal strands, coating the woven material with metal, adding flux to the material, and fusing the coating to the material with the aid of the flux to unite the strands rigidlly at their intersections.

5. he herein described method of securing and stiffening metallic wares composed of adjacentl lying or inter-secured metal elements, w ich consists in inter-weaving metal strands, galvanicall coating the woven material wlth an easily fusible metal until the meshes are reduced to a desired size, and fusing the coating to the material to unite the strands rigidly .at their intersections. r,

6. The herein described method of secur ing and stiffening metallic wares composed of adjacentl lying or inter-secured metal elements, w ich consists in inter-weaving metal strands, galvanicall coating the woven material with an easily fusible metal until the meshes are reduced to a desired size and fusing the coating to the material to fill the interstices between'inter-weaving 'coating to the material with the aid of'the flux to unite the strands rigidly at their intersections.

8. The herein described method of securing and stiffening metallic wares composed of adjacently lylng orinter-secured metal elements, which consists in inter-weaving metal strands, electrolytically coating the woven material with easily fusible metal,

adding flux to the material, said flux containing metal salt solutions capable of precipitating the metal of said solutions upon the coating; and fusing the coating to the material with theaid of the flux to unite the strands rigidly at their intersections.

In testimony whereof I aflix my signature.

FELIX KIRSGHNER. 

